after reinstalling the electric shower after installing shower back panels we are having a problem with it.
The shower is a galaxy aqua 3000, like this: http://www.showerdoc.com/galaxy-aqua-3000-electric-shower-post-2000-shower-spares
The shower works normally but then when we switch it off the water flow ends, but the heating system stays on making a boiling water sound, and it goes off only by moving the upper knob the one that operates the pressure switch.
What could be the problem?
Should I replace the pressure switch (8 in the diagram on the website)?